US4615989AExpiredUtility
Optical quality colored glass
Est. expiryApr 18, 2004(expired)· nominal 20-yr term from priority
Inventors:Willy Ritze
C03C 4/08C03C 3/19C03C 3/17
83
PatentIndex Score
64
Cited by
6
References
15
Claims
Abstract
An optical CuO-bearing, alkali- and alkaline-earth rich phosphate glass with relatively high elongation (at 20 DEG -300 DEG C. from 110x10-7 grd-1 to 138x10-7 grd-1) and a transformation range </=380 DEG C., with substantially improved transmission in the UV to blue range of the spectrum (UV-transmission at lambda =350 nm between >/=69% and >/=83%) and a very strong absorption in the red region of the spectrum (IR-absorption at lambda =700 nm between </=2% and </=12%), consisting essentially of the following synthesis/composition, in wt. %: P2O5 65-70%; SiO2 0-0.75%; B2O3 0-2%; A2O3 2.5-6%; R2O (alkali metal oxides) 11-17%; BaO 3-9.5%; CeO2 0.45-2.0%; CuO 2.55-6.55%; Cl- 0.15-0.75%; F- 0.25-1.50%; refining agent 0.10-2.00% with SIGMA CeO2+Al2O3+BaO+CuO>/=8.5 and SIGMA R2O=F-+Cl->/=21.5; optionally further containing CaO, MgO, SrO, ZnO and/or CdO.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. A phosphate glass rich in alkali and alkaline earth metal oxides and containing CuO as a coloring component for optical filter glass in the spectral range from 350 nm to 850 nm, consisting essentially of the following synthesis-composition (in wt. %): ______________________________________
P.sub.2 O.sub.5 65.00-70.00
SiO.sub.2 0.00-0.75
B.sub.2 O.sub.3 0.00-2.00
Al.sub.2 O.sub.3
2.50-6.00
R.sub.2 O 11.00-17.00
BaO 3.00-9.50
CeO.sub.2 0.45-2.00
Cl.sup.- 0.15-0.75
CuO 2.55-6.55
F.sup.- 0.25-1.50
Refining Agents 0.10-2.00
______________________________________
wherein R 2 O is at least one alkali metal oxide.
2. Glass according to claim 1, characterized in that ΣCeO 2 +Al 2 O 3 +BaO+CuO≧10.45% wt. % and ΣR 2 O+F - +Cl - ≦16.9% wt. %.
3. Glass according to claim 1, characterized in that, with 2.75-5.50 wt. % CuO in a 2 mm thick filterglass, UV-transmission at λ=350 nm can be maintained between ≧69% and ≧83%; the transmissivity difference of the two color concentrations at λ=450 nm is only 1% and does not fall below a transmission of 90%; and the absorption at wavelength λ=700 nm increases from ≦12% up to ≦2.0%.
4. Glass according to claim 1, characterized in that the transformation range (Tg) is lower than 380° C. when elongation (20°-300° C.) increases to ≧110×10 -7 grd -1 and does not increase beyond 138×10 -7 grd -1 .
5. Glass according to claim 1, characterized in that it contains: 3.0-6.0 wt. % Na 2 O 5.5-7.5 wt. % K 2 O 3.0-6.0 wt. % Li 2 O 0.0-1.0 wt. % MgO 0.0-1.5 wt. % CaO 0.0-2.0 wt. % SrO 0.0-1.0 wt. % ZnO and/or CdO 0.1-2.0 wt. % As 2 O 3 , Sb 2 O 3 or Sb 2 O 5 .
6. Glass according to claim 2, characterized in that, with 2.75-5.50 wt. % CuO in a 2 mm thick filterglass, UV-transmission at λ=350 nm can be maintained between ≧69% and ≧83%; the transmissivity difference of the two color concentrations at λ=450 nm is only 1% and does not fall below a transmission of 90%; and the absorption at wavelength λ=700 nm increases from ≦12% up to ≦2.0%.
7. Glass according to claim 2, characterized in that the transformation range (Tg) is lower than 380° C. when elongation (20°-300° C.) increases to ≧110×10 -7 grd -1 and does not increase beyond 138×10 -7 grd -1 .
8. Glass according to claim 2, characterized in that it contains: 3.0-6.0 wt. % Na 2 O 5.5-7.5 wt. % K 2 O 3.0-6.0 wt. % Li 2 O 0.0-1.0 wt. % MgO 0.0-1.5 wt. % CaO 0.0-2.0 wt. % SrO 0.0-1.0 wt. % ZnO and/or CdO 0.1-2.0 wt. % As 2 O 3 , Sb 2 O 3 or Sb 2 O 5 .
9. Glass according to claim 1, characterized in that: (a) with 2.75-5.50 wt. % CuO in a 2 mm thick filterglass, UV-transmission at λ=350 nm can be maintained between ≧69% and ≧83%; the transmissivity difference of the two color concentrations at λ=450 nm is only 1% and does not fall below a transmission of 90%; and the absorption at wavelength λ=700 nm increases from ≦12% up to ≦2.0%; and (b) the transformation range (Tg) is lower than 380° C. when elongation (20°-300° C.) increases to ≧110×10 -7 grd -1 and does not increase beyond 138×10 -7 grd -1 .
10. Glass according to claim 8, characterized in that, with 2.75-5.50 wt. % CuO in a 2 mm thick filterglass, UV-transmission at λ=350 nm can be maintained between ≧69% and ≧83%; the transmissivity difference of the two color concentrations at λ=450 nm is only 1% and does not fall below a transmission of 90%; and the absorption at wavelength λ=700 nm increases from ≧12% up to ≧2.0%.
11. Glass according to claim 8, characterized in that the transformation range (Tg) is lower than 380° C. when elongation (20°-300° C.) increases to ≧110×10 -7 grd -1 and does not increase beyond 138×10 -7 grd -1 .
12. Glass according to claim 1 consisting essentially of the following composition: ______________________________________
P.sub.2 O.sub.5 66.60-69.00
B.sub.2 O.sub.3 1.10-1.75
SiO.sub.2 0.00-0.65
Al.sub.2 O.sub.3
4.15-5.55
R.sub.2 O, being
12.35-15.50
Li.sub.2 O 3.30-4.40
Na.sub.2 O 3.45-4.40
K.sub.2 O 5.60-6.70
as well as
MgO 0.00-0.45
CaO 0.00-0.80
SrO 0.00-1.50
BaO 3.30-6.15
ZnO and/or CdO 0.00-0.45
CeO.sub.2 0.45-1.25
Cl.sup.- 0.15-0.20
F.sup.- 0.70-1.20
refining agents
As.sub.2 O.sub.3 and/or
0.40-0.95
As.sub.2 O.sub.5 ; Sb.sub.2 O.sub.3 ;
Sb.sub.2 O.sub.5
coloring agent 2.55-5.35
CuO
______________________________________
13. Glass according to claim 5 having a Tg of about 312° C. and α(20°-300° C.)×10 -7 grd -1 of about 133.1 consisting essentially of the following composition: ______________________________________
B.sub.2 O.sub.3
1.10%
Li.sub.2 O
4.40%
Na.sub.2 O
4.40%
K.sub.2 O
6.70%
CaO 0.40%
BaO 4.35%
Al.sub.2 O.sub.3
4.15%
CeO.sub.2
1.25%
As.sub.2 O.sub.3
0.40%
P.sub.2 O.sub.5
66.60%
Cl.sup.-
0.20%
F.sup.-
0.70%
CuO 5.35%
______________________________________
14. Glass according to claim 5 having a Tg of about 318.5° C. and α(20°-300° C.)×10 -7 grd -1 of about 134.0 consisting essentially of the following composition: ______________________________________
SiO.sub.2
0.65%
B.sub.2 O.sub.3
1.10%
Li.sub.2 O
4.50%
Na.sub.2 O
4.50%
K.sub.2 O
6.50%
CaO 0.80%
BaO 6.15%
ZnO 0.40%
Al.sub.2 O.sub.3
4.20%
CeO.sub.2
0.50%
As.sub.2 O.sub.3
0.40%
P.sub.2 O.sub.5
66.65%
Cl.sup.-
0.20%
F.sup.-
0.70%
CuO 2.75%
______________________________________
15. Glass according to claim 5 having a Tg of about 375° C. and α(20°-300° C.)×10 -7 grd -1 of about 115.2 consisting essentially of the following composition: ______________________________________
B.sub.2 O.sub.3
1.75%
Li.sub.2 O
3.30%
Na.sub.2 O
3.45%
K.sub.2 O
5.60%
MgO 0.45%
SrO 1.50%
BaO 3.30%
ZnO 0.45%
Al.sub.2 O.sub.3
5.55%
CeO.sub.2
0.45%
As.sub.2 O.sub.3
0.95%
P.sub.2 O.sub.5
69.35%
Cl.sup.-
0.15%
F.sup.-
1.20%
CuO 2.55%
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